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Size: 12-16 inches standard length (SL) and up to 3.5 pounds (though closer to 12+ inches SL is more typical in a home aquarium). When young, can grow at the impressive rate of up to 1+ inches per month. Don't be fooled by their small purchase size and get a small tank thinking you will have time to upgrade later; this is a common mistake.

For those of you who are thinking about buying an Oscar fish, or for those of you who have impulsively bought an Oscar fish, this article will go over some basic pointers about setting up an aquarium for your new friend. Oscars are a serious commitment due to their longevity and adult size. Having the correct set up will make their transition from little wriggler to a big brute as seamless as possible.

Astronotus ocellatus is a great aquarium fish to keep. They can be very personable and full of character. Some even interact with their owners. The first myth I'd like to dis-spell is the myth that oscars get lonely. They do not get lonely. They are not a schooling fish, and do not desire to be surrounded by other fish. Even so, some of you will want to add to your tank and are eventually going to ponder that one question; what fish make the best Oscar fish tank mates? The answer is largely dependent upon a few things.

Let’s start with a premise. The object of feeding Oscars in captivity is to duplicate or simulate the fish’s diet in the wild. To provide them with nutrition that nature has designed the Oscar’s body chemistry to metabolize. One thing, I assure you, a wild Oscar swimming in a tributary of the Amazon River has never eaten is a goldfish. Do Oscar's eat fish? Sure, fish are a component of their diet in the wild. But goldfish are not.